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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N 114get Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos, CA 94070-4111 (650)232-9600 FAX(650)232 9612 <br /> Sequoia Analytical Client Project ID L904337/Shell 341 E=ast Main <br /> 1551 Industrial Road Matrix Liquid <br /> San Carlos, CA 94070 <br /> Attention M Gregory Work Order# 9904B74 -01-06 Reported May 6, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Methanol Ethanal Iso-Propanol <br /> QC Batch# GCO5039918HSHSB GCO503991SHSHSB GG0503991SHSHSB <br /> Analy Method ISHS ISHS ISHS <br /> Prep Method- HS HS HS <br /> Analyst M M MM MM <br /> MS/MSD# 9904A5014 9904AS014 9904A5014 <br /> Sample Cone N D N D N D <br /> Prepared Date: 5/3/99 5/3/99 5/3/99 <br /> Analyzed Date: 5/3/99 5/3/99 5/3/99 <br /> Instrument I D # GCV1 GCV1 GGV1 <br /> Cone Spiked 8 0 mg/L 8 0 mg/L 8 0 mg/L <br /> Result 7 9 95 96 <br /> MS % Recovery: 99 119 120 <br /> Dup Result 7 9 91 92 <br /> MSD % Recov 99 114 115 <br /> RPD 00 43 43 <br /> RPD Limit: 0-50 0-50 0-50 <br /> LCS# LCS050399 LCS050399 LCS050399 <br /> Prepared Date 5/3/99 5/3/99 5/3/99 <br /> Analyzed Date 5/3/99 5/3/99 5/3/99 <br /> Instrument I D # GCV1 GCV1 GCV1 <br /> Cone Spiked 8 0 mg/L 8 0 mg/L 8 0 mg/L <br /> LCS Result 76 91 93 <br /> LCS % Recov 95 114 116 <br /> 50-150 - 50-150 50-150 -- <br /> LCS 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Ka I **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference <br /> Project M ager 99041374 SSS <1 <br />